How to compute cos(π/3) with Angle sum and difference
identities?
Hello. I am only allowed to use the Pythagorean trigonometric identity, Angle sum and difference identities, and the fact that sine and cosine are periodic functions with period 2π.
I tried it like this: cos(π/3)=cos(π/6+π/6)=cos(π/6)cos(π/6)−sin(π/6)sin(π/6)=cos2(π/6)−sin2(π/6) Can I now somehow make use of the Pythagorean trigonometric identity?
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